Nathan hunt



@with faire @anni @frn IMPROVEMNTS `IN ENGINE-PISTONS.

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. t To ALL WHOM 1T MAY looNeERN':

Be it known that I, NATHAN HUNT, of Salem, in the county of Columbiana,and State oiOhio,` hnive invented a new and useful Improvement inPistons;- a .nd I do hereby declare that the following is a full, clear,

and exact` description thereof, which will enable those skilled in' theart to make and use the same, reference being had to the accompanyingdrawings, forming part of'this specification. v

AThis invention relates to a new and improved rnethod of constructingthe pistons of steam-engine cylinders,

expanded by the press-ure of the steam, as willbe hereinafter more fullydescribed. 4

Figure' i represents aaertical central section of the piston, it bei@through the line zx of fig. 2. 'Figure 2 is a horizontal section of thesame through the line lr/.y of fig. 1. Similar letters of referenceindicate corresponding parts. i A is the piston-head, which is rigidlyattached to.' the piston-rod. B is the p'istonnod. C is the vfollower,

and it consists in 'making ,the piston self-packing by means of rings ofpeculiar constructionfind which are f which is slipped on/to the lowerend of the piston-rod, and fastened with a screw-nut, a, .as seen.Therouxe four packing-rings, two outside andftwo inside. Theroutsiderings are marked D, and the inside rings are marked E.

The rings D are l -shaped,l as seen in the drawing, and meet and formajoiat in the centre ofthe piston, their outer surfaces forming. theentirewearing surface against the cylinder. TheV inner surfaces (orshort part ofthe L,) enter the chamber` or groove formed between thepiston-head A and the follower C. The'insidc rings VE are square intheir cross-section, and occupy the interior portion ofthe chamber,being eoloredblue in the drawing. The piston-head A and the follower Care tted and screwed together tightly, and the rings are fitted into thechamber, so that they are allowed to 'expand freely. i

It will be noticed that the peripherics of the piston-head and thefollower are bevellcd, so as to leave an annular space, e, inside therings' D. lhc steam enters this annular space freely, -and expands theriugson the upper and lower sides of the piston alternately, as it ismoved up and down or back and forth in the cylinder.

All the rings (D and E) iu one ormore places are cut, as seen in g.,2,at ff, and the pieces :ire arranged to break' joints. The annular steamspace e is made of a depth to correspond with the diameter 'of thepiston, or as experiencernight prove' to be best. The advantages of thispiston over those iu'ordinary useare many, and must be obvious to allwho are acquainted with the subject.

What I claim as-new, and desire to secure by'Letters Patent,y is 4 Theconstruction and arrangement of the L-shaped packing-ringsl),*whoseinner projections rest against each other, and are inserted "in thespace betweenthe piston-head A and follower C, holding the packingiringsE in position, said piston-head and follower provided with inclinedrecesses e upon their peripherie s, to admit the steambehind the rings Band E alternatelat each upward and downward stroke of the piston, asherein shown and described.

NATHAN IIUNT.

Witnesses R. V. HAMPsoN, Y Trios. F. SHARPNOCK.

